WO2019143486A1 - Procédé et appareil pour coder et décoder des scènes tridimensionnelles dans et à partir d'un flux de données - Google Patents

Procédé et appareil pour coder et décoder des scènes tridimensionnelles dans et à partir d'un flux de données Download PDF

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Publication number
WO2019143486A1
WO2019143486A1 PCT/US2019/012272 US2019012272W WO2019143486A1 WO 2019143486 A1 WO2019143486 A1 WO 2019143486A1 US 2019012272 W US2019012272 W US 2019012272W WO 2019143486 A1 WO2019143486 A1 WO 2019143486A1
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WIPO (PCT)
Prior art keywords
data
color
depth
geometry
patch
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PCT/US2019/012272
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English (en)
Inventor
Julien Fleureau
Renaud Dore
Thierry Tapie
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Interdigital Vc Holdings, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by Interdigital Vc Holdings, Inc. filed Critical Interdigital Vc Holdings, Inc.
Priority to CN201980014202.2A priority Critical patent/CN111742548B/zh
Priority to US16/962,157 priority patent/US11375235B2/en
Priority to EP19701747.8A priority patent/EP3741111A1/fr
Publication of WO2019143486A1 publication Critical patent/WO2019143486A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/10—Processing, recording or transmission of stereoscopic or multi-view image signals
    • H04N13/106—Processing image signals
    • H04N13/161—Encoding, multiplexing or demultiplexing different image signal components
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/597—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding specially adapted for multi-view video sequence encoding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/10—Processing, recording or transmission of stereoscopic or multi-view image signals
    • H04N13/106—Processing image signals
    • H04N13/172—Processing image signals image signals comprising non-image signal components, e.g. headers or format information
    • H04N13/178—Metadata, e.g. disparity information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/20—Image signal generators
    • H04N13/261—Image signal generators with monoscopic-to-stereoscopic image conversion
    • H04N13/268—Image signal generators with monoscopic-to-stereoscopic image conversion based on depth image-based rendering [DIBR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/70—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by syntax aspects related to video coding, e.g. related to compression standards

Definitions

  • the present principles generally relate to coding and decoding of a three-dimensional (3D) scene or a sequence of three-dimensional scenes in and from a data stream. Particularly, but not exclusively, the technical field of the present principles is related to encoding/decoding of color images for the textures and depth images or 3D meshes for the geometry of the scenes.
  • Immersive video also called 360° flat video, allows the user to watch all around himself through rotations of his head around a still point of view. Rotations only allow a 3 Degrees of Freedom (3DoF) experience.
  • 3DoF 3 Degrees of Freedom
  • 3DoF video may quickly become frustrating for the viewer who would expect more freedom, for example by experiencing parallax.
  • 3DoF may also induce dizziness because of a user never only rotates his head but also translates his head in three directions, translations which are not reproduced in 3DoF video experiences.
  • Volumetric video (also known as 6 Degrees of Freedom (6DoF) video) is an alternative to 3DoF video.
  • 6DoF 6 Degrees of Freedom
  • the user can also translate his head, and even his body, within the watched content and experience parallax and even volumes.
  • Such videos considerably increase the feeling of immersion and the perception of the scene depth and also prevent from dizziness by providing consistent visual feedback during head translations.
  • the content is created by the means of dedicated sensors allowing the simultaneous recording of color and depth of the scene of interest.
  • the use of rig of color cameras combined with photogrammetry techniques is a common way to perform such a recording.
  • a volumetric video is a sequence of 3D scenes.
  • a solution to encode volumetric videos is to project each 3D scene of the sequence of 3D scene onto projection maps which are clustered in color pictures and depth pictures, called patches. Patches are packed in color and depth images which are stored in the video track of a video stream.
  • This encoding has the advantage to make use of standard image and video processing standards.
  • pixels of the color pictures are de-projected at a depth determined by information stored in the associated depth picture.
  • Such solutions are effective.
  • encoding this huge amount of data as images in the video track of a video stream raises problems.
  • the size of the bit stream induces bitrate technical issues regarding storage space, transmission over a network and decoding performances.
  • the present principles relate a method of encoding a 3D scene in a stream.
  • the present disclosure relates to a method of encoding a three-dimensional scene in a stream.
  • the method comprises:
  • a patch comprising:
  • ⁇ a geometry data of a first geometry type comprising a depth picture, or a geometry data of a second geometry type comprising an identifier of a three-dimensional object represented as a mesh; - generating a color image by packing color pictures of said patches and storing a color data in corresponding patch, the color data comprising a description of a location of the color picture of said patch as packed in the color image;
  • a patch data item comprising the de-projection data, the color data of a patch and the geometry data of said patch.
  • the present disclosure also relates to a device adapted to encode a three-dimensional scene in a stream.
  • the device comprises a memory associated with a processor configured to execute the present method of encoding a three-dimensional scene in a stream.
  • the present disclosure also relates to a method of decoding a three-dimensional scene from a data stream.
  • the method comprises:
  • a patch data item comprising:
  • a geometry data of a first geometry type comprising a description of a location of a depth picture in the depth image, or a geometry data of a second geometry type comprising an identifier of a three-dimensional object represented as a mesh;
  • the present disclosure also relates to a device adapted to decode a three-dimensional scene from a data stream.
  • the device comprises a memory associated with a processor configured to execute the present method of decoding a three-dimensional scene from a data stream.
  • the present disclosure also relates to a data stream carrying data representative of a three- dimensional scene.
  • the data stream comprises: at least a color image comprising color pictures packed in said colored image;
  • At least a depth image comprising depth pictures packed in said depth image, a depth image being associated with a first color image
  • a patch data item comprising:
  • a geometry data of a first geometry type comprising a description of a location of a depth picture in the depth image associated with the first color image, or a geometry data of a second geometry type comprising an identifier of a three-dimensional object represented as a mesh.
  • - Figure 1 shows a three-dimension (3D) model of an object and a points of a point cloud corresponding to the 3D model, according to a non-restrictive embodiment of the present principles
  • FIG. 2 shows an image representing a three-dimension scene comprising a surface representation of several objects captured as a point cloud, according to a non-restrictive embodiment of the present principles
  • FIG. 3 illustrates an example of the encoding, transmission and decoding of a sequence of 3D scenes, according to a non-restrictive embodiment of the present principles
  • FIG. 4 illustrates two patches relative to the 3D scene of figure 2, each patch comprising a color picture, a depth picture and de -projection data, according to a non-restrictive embodiment of the present principles
  • FIG. 5 shows a patch obtained by the projection of a part of the 3D scene which is represented as a mesh, according to a non-restrictive embodiment of the present principles
  • FIG. 7 shows an example of an embodiment of the syntax of a stream when the data arc transmitted over a packet-based transmission protocol, according to a non-restrictive embodiment of the present principles
  • FIG. 8 shows an example architecture of a device which may be configured to implement a method described in relation with figures 9 and/or 10, according to a non-restrictive embodiment of the present principles
  • FIG. 9 illustrates a method for encoding a point cloud in a stream, in a device of figure 8 configured to be an encoder 31 of figure 3, according to a non-restrictive embodiment of the present principles
  • FIG. 10 illustrates a method for decoding a three-dimensional scene from a stream, in a device of figure 8 configured to be a device 33 of figure 3, according to a non-restrictive embodiment of the present principles.
  • each block represents a circuit element, module, or portion of code which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that in other implementations, the function(s) noted in the blocks may occur out of the order
  • references herein to“in accordance with an example” or“in an example” means that a particular feature, structure, or characteristic described in connection with the example can be included in at least one implementation of the present principles.
  • the appearances of the phrase in accordance with an example” or“in an example” in various places in the specification are not necessarily all referring to the same example, nor are separate or alternative examples necessarily mutually exclusive of other examples.
  • Reference numerals appearing in the claims are by way of illustration only and shall have no limiting effect on the scope of the claims. While not explicitly described, the present examples and variants may be employed in any combination or sub-combination.
  • Figure 1 shows a three-dimension (3D) model of an object 10 and a points of a point cloud
  • Model 10 may be a 3D mesh representation and points of point cloud 11 may be the vertices of the mesh. Points 11 may also be points spread on the surface of the faces of the mesh. Model 10 may also be represented as a splatted version of point of cloud 11; that is the surface of model 10 is created by splatting the point of point of cloud 11. Model 10 may also be represented by many different representations such as voxels or splines.
  • Figure 1 illustrates that it is always possible to define a point cloud from a surface representation of a 3D object. Reciprocally it is always possible to create a surface representation of a 3D object from a point of cloud.
  • FIG. 2 shows an image 20 representing a three-dimension scene comprising a surface representation of several objects captured as a point cloud.
  • the image 20 is generated from a point of view different of the acquisition point of view.
  • the character at the right of the image 20 is not complete, points of his left arm and his back are not available (e.g. they have not been captured) to fulfill the surface representation.
  • the 3D scene may comprise different types of representation. For example, characters in the scene are represented as point clouds while statues are represented as textured meshes. A 3D scene is always rendered from a point of view.
  • All points of the scene are not visible from the point of view, some parts of the scene are occulted by visible parts.
  • a viewer of a volumetric video may move within the 3D scene in an area defining a set of possible points of view. Every point of the 3D scene visible from this set of possible points of view has to be encoded.
  • Figure 3 illustrates an example of the encoding, transmission and decoding of a sequence of 3D scenes.
  • a sequence of at least 3D scene 30 is encoded in a stream 32 by an encoder 31 according to the principles of the present encoding method.
  • a decoder 33 obtains stream 32 from a source.
  • the source belongs to a set comprising:
  • a local memory e.g. a video memory or a RAM (or Random Access Memory), a flash memory, a ROM (or Read Only Memory), a hard disk;
  • a storage interface e.g. an interface with a mass storage, a RAM, a flash memory, a ROM, an optical disc or a magnetic support;
  • a communication interface e.g. a wireline interface (for example a bus interface, a wide area network interface, a local area network interface) or a wireless interface (such as a IEEE 802.11 interface or a Bluetooth® interface); and
  • a wireline interface for example a bus interface, a wide area network interface, a local area network interface
  • a wireless interface such as a IEEE 802.11 interface or a Bluetooth® interface
  • a user interface such as a Graphical User Interface enabling a user to input data.
  • Decoder 33 decodes a sequence of 3D scenes 34 from stream 32 according to the present decoding method. According to the present principles, sequence of 3D scene 34 is as similar to sequence of 3D scenes 30 as possible. Sequence of 3D scenes 34 may be obtained from a source by a rendered 35. Renderer 35 computes images to be displayed for a 6DoF video viewing experience.
  • Figure 4 illustrates two patches relative to the 3D scene of figure 2, each patch comprising a color picture, a depth picture and de-projection data.
  • Different projection process may be used to generate patches.
  • the patches may be generated by a peeling projection process.
  • Another possibility is to use octrees of cube mapping projections.
  • Any suitable projection process may be used to generate a patch.
  • a projection process suitable for the present principles generates a set of patches, patches comprising a color picture, a depth picture (or a unique picture storing both pixel data) and de-projection data to allow the decoder to decode the three-dimensional scene from the two pictures.
  • de-projection data may comprise coordinates of the center of projection, the solid angle in the frame of reference that the patch correspond to (e.g. [0min,0max], [(pmin,cpmax]) and a range of depth value used for encoding the depth in the depth picture. Every data needed for de-projecting the information stored in the two pictures by the projection process is comprised in the de-projection data. These data allow the decoder to retrieve the 3D coordinates and the color of points projected in the two projection maps. On the example of figure 4, a patch 40 is generated comprising a color picture 401, a depth picture 402 and a set of de-projection data 403.
  • This patch encodes data representative of the front side of one of the characters of the 3D scene of figure 2.
  • Color picture 401 is the result of the projections of points of this part of the scene on a plane localized in the 3D space of the scene.
  • Pixels of depth picture 402 stores the distances of between this plane and this part of the 3D scene.
  • the brighter the depth pixel the closer to the plane the point of the scene.
  • a black depth pixel means there is no color information at these coordinates in the color picture.
  • a second example of patch 41 is provided on figure 4.
  • Patch 41 corresponds to a part of a second character of the 3D scene of figure 2.
  • Patch 41 comprises a color picture 411, a depth picture 412 and de-projection data 413.
  • De-projection data 413 are different id de-projection data 403.
  • the center of projection may be different, the solid angle of the 3D space encoded in these two pictures is different and the dynamics of the depth encoding in the depth picture may also be different.
  • Patches may have different sizes and different shapes. On the examples of the present document, every patch is rectangular. This is only an example and, according to the projection process, patches may have any shape (e.g. an ellipse or a trapezoid). If not set by default, this information is comprised in the de-projection data.
  • a set of patches representative of the 3D scene to encode are obtained according to any suitable method. These patches are then packed into color and depth images in order to be added to the video track of a data stream, for example according to the ISO BMFF standard.
  • the cumulative size of color and depth pictures of patches for a 3D scene may be substantial.
  • Figure 5 shows a patch obtained by the projection of a part of the 3D scene which is represented as a mesh.
  • a 3D scene is composed of 3D information which may be structured according to a variety of representation.
  • a part of the 3D scene may be composed of point clouds, another part of splines, yet another part of colored voxels.
  • Point clouds are the most used representation for volumetric videos, in particular for real world acquisition.
  • objects e.g. fiction characters, decorative features, walls, floor
  • 3D meshes created by computer graphics methods.
  • a 3D mesh 54 belongs to the scene.
  • a 3D mesh comprises vertices and faces.
  • Vertices comprise a set of components about how the light is managed on the surface of the mesh.
  • the mesh is associated with a picture called texture and vertices comprise texture coordinates.
  • Such patches have a geometry data (the depth picture) of the first type of a group of two geometry types.
  • points of the 3D scene represented as 3D meshes are projected in separate patches.
  • the projection of 3D mesh 54 generates a patch 50 comprising a color picture 51, a depth picture 52 and de-projection data 53.
  • depth picture 52 is representative of the geometry (that is vertex coordinates and faces only) of 3D mesh 54 according to projection conditions.
  • Information about light and texture coordinates, according to projection conditions, is encoded in color image 51.
  • the number of bytes used to encode texture and light features in a unique color picture is smaller than what is required to encode the same information as vertex components plus a texture picture because these data are likely to change during the sequence of 3D scene and so, need to be encoded in the stream at each modification.
  • patches obtained by projecting points of a part of the 3D scene represented as a 3D mesh comprise an identifier of this mesh.
  • the patch keeps a pointer to the 3D mesh it has been generated from.
  • patch 50 does not comprise depth picture 52 but only a data identifying 3D mesh 54.
  • patches have a geometry data of the second type of the group of two geometry types.
  • a set of patches as described in regard to figures 4 and 5 is obtained.
  • This set of patches carries data for every point of the scene that have to be encoded in the data stream as determined by the set of possible points of view.
  • Figure 6 illustrates packing of the obtained patches in color and depth images. A packing operation is performed on every color picture obtained for a 3D scene to generate a color image 61.
  • a packing operation is performed on depth picture obtained for patches having a geometry data of the first type to generate a depth image 62. Only the depth pictures obtained by projecting parts of the 3D scene which are not represented as 3D meshes are stored in the packed depth image.
  • Figure 7 shows an example of an embodiment of the syntax of a stream when the data are transmitted over a packet-based transmission protocol.
  • Figure 7 shows an example structure 70 of a volumetric video stream.
  • the structure consists in a container which organizes the stream in independent elements of syntax.
  • the structure may comprise a header part 71 which is a set of data common to every syntax elements of the stream.
  • the header part comprises metadata about syntax elements, describing the nature and the role of each of them.
  • the header part may also comprise the coordinates of the set of possible points of view used for the encoding the first color image for 6DoF rendering and information about the size and the resolution of pictures.
  • the structure comprises a payload, also called video tracks, comprising a color picture 72 and a depth picture 73. Images may have been compressed according to a video compression method.
  • a third element of syntax 74 of the video track comprises a set of patch data items.
  • a patch data item is a data structures comprising values encoded as bytes. The data structure may be compressed using any suitable method.
  • a patch data item comprises de-projection data, a location (and optionally a shape and a size) of a color picture in the color image, and a geometry data.
  • a geometry data of the first geometry type comprises a location (and optionally a shape and a size) of a depth picture in the depth image.
  • a geometry data of the second geometry type comprises an identifier of a 3D mesh of the 3D scene.
  • a stream may comprise a sequence of triplets of these data. For each color picture in the first element of syntax of the stream, a depth picture is associated with the color picture in the second element of syntax and a set of patch data items is associated with the color picture in the third element of syntax of the stream. These triplets are ordered and associated with temporal information such as a time stamp for a dynamic video rendering.
  • color map, depth map and the metadata would typically be referenced in ISOBMFF tracks in a box of type MOOV, with color map and depth map data themselves embedded in media-data box of type mdat.
  • Figure 8 shows an example architecture of a device 80 which may be configured to implement a method described in relation with figures 9 and/or 10.
  • the device 80 may be configured to be an encoder 31 or a decoder 33 of figure 3.
  • the device 80 comprises following elements that are linked together by a data and address bus 81 :
  • microprocessor 82 which is, for example, a DSP (or Digital Signal Processor);
  • ROM Read Only Memory
  • RAM or Random Access Memory
  • a power supply e.g. a battery.
  • the power supply is external to the device.
  • the word « register » used in the specification may correspond to area of small capacity (some bits) or to very large area (e.g. a whole program or large amount of received or decoded data).
  • the ROM 83 comprises at least a program and parameters.
  • the ROM 83 may store algorithms and instructions to perform techniques in accordance with present principles. When switched on, the CPU 82 uploads the program in the RAM and executes the corresponding instructions.
  • the RAM 84 comprises, in a register, the program executed by the CPU 82 and uploaded after switch-on of the device 80, input data in a register, intermediate data in different states of the method in a register, and other variables used for the execution of the method in a register.
  • the implementations described herein may be implemented in, for example, a method or a process, an apparatus, a computer program product, a data stream, or a signal. Even if only discussed in the context of a single form of implementation (for example, discussed only as a method or a device), the implementation of features discussed may also be implemented in other forms (for example a program).
  • An apparatus may be implemented in, for example, appropriate hardware, software, and firmware.
  • the methods may be implemented in, for example, an apparatus such as, for example, a processor, which refers to processing devices in general, including, for example, a computer, a microprocessor, an integrated circuit, or a programmable logic device. Processors also include communication devices, such as, for example, computers, cell phones, portable/personal digital assistants ("PDAs”), and other devices that facilitate communication of information between end-users.
  • PDAs portable/personal digital assistants
  • the three- dimensional scene 30 is obtained from a source.
  • the source belongs to a set comprising:
  • a local memory e.g. a video memory or a RAM (or Random Access Memory), a flash memory, a ROM (or Read Only Memory), a hard disk;
  • a storage interface e.g. an interface with a mass storage, a RAM, a flash memory, a ROM, an optical disc or a magnetic support;
  • a communication interface e.g. a wireline interface (for example a bus interface, a wide area network interface, a local area network interface) or a wireless interface (such as a IEEE 802.11 interface or a Bluetooth® interface); and
  • a wireline interface for example a bus interface, a wide area network interface, a local area network interface
  • a wireless interface such as a IEEE 802.11 interface or a Bluetooth® interface
  • the stream is sent to a destination; specifically, the destination belongs to a set comprising:
  • a local memory e.g. a video memory or a RAM, a flash memory, a hard disk;
  • a storage interface e.g. an interface with a mass storage, a RAM, a flash memory, a ROM, an optical disc or a magnetic support;
  • a communication interface e.g. a wireline interface (for example a bus interface (e.g.
  • USB Universal Serial Bus
  • a wide area network interface a wide area network interface
  • a local area network interface a HDMI (High Definition Multimedia Interface) interface
  • a wireless interface such as a IEEE 802.11 interface, WiFi ® or a Bluetooth ® interface.
  • a bitstream comprising data representative of the volumetric scene is sent to a destination.
  • the bitstream is stored in a local or remote memory, e.g. a video memory (84) or a RAM (84), a hard disk (83).
  • the bitstream is sent to a storage interface (85), e.g. an interface with a mass storage, a flash memory, ROM, an optical disc or a magnetic support and/or transmitted over a communication interface (86), e.g. an interface to a point to point link, a communication bus, a point to multipoint link or a broadcast network.
  • the bitstream is obtained from a source.
  • the bitstream is read from a local memory, e.g. a video memory (84), a RAM (84), a ROM (83), a flash memory (83) or a hard disk (83).
  • the bitstream is received from a storage interface (85), e.g. an interface with a mass storage, a RAM, a ROM, a flash memory, an optical disc or a magnetic support and/or received from a communication interface (85), e.g. an interface to a point to point link, a bus, a point to multipoint link or a broadcast network.
  • the device 80 is configured to implement a method described in relation with figure 9 or 10, and belongs to a set comprising:
  • - a game device - a tablet (or tablet computer);
  • a server e.g. a broadcast server, a video-on-demand server or a web server.
  • Figure 9 illustrates a method for encoding a point cloud in a stream, in a device 80 (described with regard to figure 8) configured to be an encoder, according to a non -restrictive embodiment of the present principles.
  • a step 90 the different parameters of the device 80 are updated.
  • the 3D scene is obtained from a source, a set of possible points of view is determined in the space of the 3D scene, a projection mapping is initialized, and sizes and resolutions of the projection maps, pictures and images are determined.
  • a projection process is performed on the 3D scene in order to obtain a set of color and depth pictures representative of the part of the scene visible from every point of view of the set of possible points of view. Any suitable method may be used to obtain this set of color and depth pictures.
  • Color and depth pictures are stored in a data structure called a patch. Data needed to perform the de-projection of the color and depth pictures are computed from the projection process parameters and stored in the patch data structure.
  • geometry data there are two types of geometry data for a patch.
  • a patch as a geometry data comprising the depth picture.
  • Such geometry data is of the first type of geometry data.
  • Objects of the 3D scene represented by 3D meshes are projected in separate patch comprising a color picture and a geometry data comprising an identifier pointing to the 3D mesh the patch has been generated from.
  • Such geometry data is of the second type of geometry data.
  • geometry data of the second type may also comprise the depth picture.
  • a packing process is performed for every color picture of the obtained set of patches to generate a color image.
  • Any suitable method to efficiently pack the color pictures in the color image may be used at this step.
  • the color image is also called color patch atlas.
  • Color pictures are arranged in the color image with a given angular resolution (e.g. 3 seconds per pixel or 5 seconds per pixel) according to the size that the proj ection of points of the color picture will occupy in the color patch atlas.
  • the location of a color picture in the color image is stored in a data structure called color data. If the shape of color pictures is not set by default (e.g. a rectangle), the shape used for this color picture in the color image is stored in the color data structure. If the resolution of the color pictures packed in the color image is not constant (i.e. not the same for every color picture), the size of the color picture in the color image is stored in the color data.
  • a step 93 depth pictures of patches of the first type of geometry are packed in a depth image. Only the depth pictures of patches of the first type are packed (reason why the depth picture may have been removed from the geometry data for patches of the second type of geometry). This has the advantage to save a lot of bit rate in the stream as the depth image is noticeably smaller than the color image, and noticeably smaller than a depth image in which every depth picture would be packed.
  • An identifier pointing to a 3D mesh requires a small number of bytes in a stream whereas, the same information encoded as a picture requires much more bytes.
  • the stream representative of the 3D scene is generated according to the structure described in relation with figure 7.
  • the 3D meshes pointed by identifiers of geometry data of the second type may be added in a fourth element of syntax of the stream or transmitted to decoders by different ways (e.g. local storage).
  • Figure 10 illustrates a method for decoding a three-dimensional scene from a stream, in a device 80 (described with regard to figure 8) configured to be a device 33 of figure 3, according to a non-restrictive embodiment of the present principles.
  • a step 100 the different parameters of the device 80 are updated.
  • the stream is obtained from a source, a set of possible points of view is determined in the space of the 3D scene.
  • the set of possible points of view is decoded from the stream.
  • a list of 3D meshes is obtained from a source and stored in memory. 3D meshes comprise only vertex coordinates and face list.
  • the list of 3D meshes is retrieved from a fourth element of syntax of the stream that may be synchronized.
  • a step 101 data representative of a 3D scene are obtained from the stream. These data comprise a color image, a depth image and a set of data structures called patch data items.
  • a patch data item comprises de-projection data, a location (and optionally a shape and a size) of a color picture in the color image, and a geometry data.
  • a geometry data of the first geometry type comprises a location (and optionally a shape and a size) of a depth picture in the depth image.
  • a geometry data of the second geometry type comprises an identifier of a 3D mesh stored in the list of 3D meshes.
  • Next steps of the present method are then repeated for at least a patch data item, preferentially for each patch data item.
  • a test is performed. If the geometry data of the patch is of the first geometry type, step 103 is performed. Otherwise, if the geometry data of the patch is of the second geometry type, step 104 is performed.
  • a color picture is retrieved from the color image using the data of the color data structure; a depth picture is retrieved from the depth image using the data of the geometry data of the patch. Pixels of the color picture are de-projection by using the de-projection data at a depth calculated according to corresponding pixel in the depth picture. A part of the scene is thus decoded.
  • a color picture is retrieved from the color image using the data of the color data structure;
  • a 3D mesh is retrieved from the list of 3D meshes stored in memory according to the identifier comprised in the geometry data of the patch.
  • Pixels of the color picture are de- projection by using the de-projection data at a depth calculated according to the surface of the retrieved 3D mesh.
  • the de-projecting process is able to calculate the coordinates of the de- projected pixels according to the de-projection data on the surface of the mesh. A part of the scene is thus decoded.
  • step 103 or step 104 When step 103 or step 104 has been performed on each patch data item, the entire 3D scene has been decoded.
  • step 105 the decoded 3D scene is transmitted to a further module, for example a Tenderer 35 of figure 3.
  • the present disclosure is not limited to the embodiments previously described.
  • the present disclosure is not limited to methods and devices for encoding/decoding a stream carrying data representative of a three-dimension scene (or a sequence of three-dimension scenes) but also extends to methods of rendering a 3D scene in a 3 degrees of freedom manner or in a volumetric manner (i.e. 3DoF+ or 6DoF) to any devices implementing these methods and notably any devices comprising at least one CPU and/or at least one GPU.
  • the present disclosure also relates to a method (and a device configured) for displaying images rendered from the data stream comprising the information representative of the three- dimension scene.
  • the present disclosure also relates to a method (and a device configured) for transmitting and/or receiving the stream encoded according to the present principles.
  • the implementations described herein may be implemented in, for example, a method or a process, an apparatus, a computer program product, a data stream, or a signal. Even if only discussed in the context of a single form of implementation (for example, discussed only as a method or a device), the implementation of features discussed may also be implemented in other forms (for example a program).
  • An apparatus may be implemented in, for example, appropriate hardware, software, and firmware.
  • the methods may be implemented in, for example, an apparatus such as, for example, a processor, which refers to processing devices in general, including, for example, a computer, a microprocessor, an integrated circuit, or a programmable logic device.
  • Processors also include communication devices, such as, for example, Smartphones, tablets, computers, mobile phones, portable/personal digital assistants ("PDAs"), and other devices that facilitate communication of information between end-users.
  • communication devices such as, for example, Smartphones, tablets, computers, mobile phones, portable/personal digital assistants ("PDAs"), and other devices that facilitate communication of information between end-users.
  • PDAs portable/personal digital assistants
  • Implementations of the various processes and features described herein may be embodied in a variety of different equipment or applications, particularly, for example, equipment or applications associated with data encoding, data decoding, view generation, texture processing, and other processing of images and related texture information and/or depth information.
  • Examples of such equipment include an encoder, a decoder, a post-processor processing output from a decoder, a pre-processor providing input to an encoder, a video coder, a video decoder, a video codec, a web server, a set-top box, a laptop, a personal computer, a cell phone, a PDA, and other communication devices.
  • the equipment may be mobile and even installed in a mobile vehicle.
  • the methods may be implemented by instructions being performed by a processor, and such instructions (and/or data values produced by an implementation) may be stored on a processor-readable medium such as, for example, an integrated circuit, a software carrier or other storage device such as, for example, a hard disk, a compact diskette (“CD”), an optical disc (such as, for example, a DVD, often referred to as a digital versatile disc or a digital video disc), a random access memory (“RAM”), or a read-only memory (“ROM”).
  • the instructions may form an application program tangibly embodied on a processor-readable medium. Instructions may be, for example, in hardware, firmware, software, or a combination.
  • a processor may be characterized, therefore, as, for example, both a device configured to carry out a process and a device that includes a processor-readable medium (such as a storage device) having instructions for carrying out a process. Further, a processor-readable medium may store, in addition to or in lieu of instructions, data values produced by an implementation.
  • implementations may produce a variety of signals formatted to carry information that may be, for example, stored or transmitted.
  • the information may include, for example, instructions for performing a method, or data produced by one of the described implementations.
  • a signal may be formatted to carry as data the rules for writing or reading the syntax of a described embodiment, or to carry as data the actual syntax -values written by a described embodiment.
  • Such a signal may be formatted, for example, as an electromagnetic wave (for example, using a radio frequency portion of spectrum) or as a baseband signal.
  • the formatting may include, for example, encoding a data stream and modulating a carrier with the encoded data stream.
  • the information that the signal carries may be, for example, analog or digital information.
  • the signal may be transmitted over a variety of different wired or wireless links, as is known.
  • the signal may be stored on a processor-readable medium.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Library & Information Science (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Image Generation (AREA)

Abstract

L'invention concerne des procédés et des dispositifs pour coder et décoder un flux de données portant des données représentatives d'une scène tridimensionnelle, le flux de données comprenant des trames de couleur condensées dans une image de couleur; des trames de profondeur condensées dans une image de profondeur; un ensemble d'éléments de données de carreau comprenant des données de déprojection; et des données pour récupérer une trame de couleur dans l'image de couleur et des données géométriques. Deux types de données géométriques sont possibles. Le premier type de données décrit comment récupérer une trame de profondeur dans l'image de profondeur. Le second type de données comprend un identifiant d'un maillage 3D. Les coordonnées de sommet et les faces de ce maillage sont utilisées pour récupérer l'emplacement de points dans la scène déprojetée.
PCT/US2019/012272 2018-01-19 2019-01-04 Procédé et appareil pour coder et décoder des scènes tridimensionnelles dans et à partir d'un flux de données WO2019143486A1 (fr)

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US16/962,157 US11375235B2 (en) 2018-01-19 2019-01-04 Method and apparatus for encoding and decoding three-dimensional scenes in and from a data stream
EP19701747.8A EP3741111A1 (fr) 2018-01-19 2019-01-04 Procédé et appareil pour coder et décoder des scènes tridimensionnelles dans et à partir d'un flux de données

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EP3741111A1 (fr) 2020-11-25
CN111742548B (zh) 2023-06-27

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